Trouble on multiple browsers, AIM, Facebook

I'm having several problems which I think have a common cause. AIM won't sign on, but Skype works perfectly fine. Meanwhile, all of my browsers (Firefox, Opera, IE) are having trouble loading the same pages. The pages are unrelated, from my school's website to random blogs. I'm also having trouble with the media viewer for Facebook.

I'm lumping these problems together because they all started at exactly the same time. I tried a system restore, I scanned using Webroot AntiVirus with Spy Sweeper, and after deleting what it picked up, nothing changed. I removed Opera and redownloaded it, but it's still having the same problems with certain pages.

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